Extension leaf for sewing machines



March 22, 1949. s ADLER v 2,464,838

EXTENSION LEAF FOR SEWING- MACHINES Filed Aug. 3o, 1946 TTORNE YS atented Mar. 22, 1949 UNITED STATES PATENT OFFICE EXTENSION LEAF FOR SEWING MACHINES Solomon Adler, Kew Gardens, N. Y.

Application August 30, 1946, Serial No. 693,917

1 Claim.

This invention relates to an extension leaf for sewing machines.

Extension leaves are used to enlarge the bed plate of the sewing machine and to give support to the left hand of the operator. In addition to this, provision is usually made in the conventional type of machine for a retractable plate lying flush with the bed plate to give access, when open, to the shuttle or bobbn case and other parts of the subjacent stitching and feeding mechanism.

It is an object of this invention to combine these two members by providing a swinging plate which performs the function of a retractable closure for the adjacent stitching mechanism and also makes possible an enlargement of the available bed plate space.

A further object is to provide an improved form of extension leaf which is retractable without interfering with the general design of a small portable machine. Other objects and advantages will appear from the following description, when read in connection with the drawings, in which Fig. 1 is a vertical section through the frame and extension leaf, showing the leaf in extended position and also indicating the adjacent parts of the stitching and feeding mechanism;

Fig. 2 is a similar section at right angles to Fig. 1 and illustrating a view of the leaf from the interior of the machine, the leaf being likewise in an extended position; and

Fig. 3 is an end view, partly in section showing the leaf during retraction.

Referring to the drawings, it will be seen that the sewing machine is provided with a rectangular frame which comprises side plates I and 2, and an end plate 3. The frame plates are suspended from the bed 4 and surround the stitching and feeding mechanism which is located in the base portion of the machine.

The leaf, preferably, is likewise of rectangular shape and is hinged to the frame by pivots 5, which slide in vertical slots 6 of the lateral frame plates. The pivots are located at or very close to the corners of the extension leaf. This arrangement permits swinging of the leaf without interference with the adjacent parts of the stitching and feeding mechanism.

Vertical webs l serve as guide members for the leaf during retraction and hold the leaf in place within the frame. The leaf is provided also with projecting arms 8 which, when the leaf is extended, latch under angle brackets 9 of the frame.

A leaf spring l is secured to the base plate of the machine, bearing with its other end against a projecting part of the leaf. This spring tends to push the leaf outwards as soon as the spring latch I I is released. In order to extend the leaf, it is therefore only necessary to pull the latch whereupon the leaf will automatically be propelled outside the frame. The leaf will then be in the vertical position indicated by dotted lines in Fig. 1 and can easily be swung into a horizontal plane.

The end plate 3 of the frame has an opening I2 for access to the bobbn I3. This opening is closed by a matching projection I4 of the leaf when the leaf is retracted.

It will be understood that by swinging the leaf outside the frame and bringing it into horizontal position the bed plate is extended and simultaneously access is gained to the bobbn case.

It is obvious that a number of modifications can be made without departing from the spirit of the invention. It is, in particular, possible to omit the end plate 3 of the frame entirely so that the extension leaf constitutes the only closure of the frame at this end when retracted.

I, therefore, do not wish to be limited otherwise than by the appended claim.

What I claim is: f

In a sewing machine, a bed plate, a working mechanism subjacent said bed plate, vertical frame walls suspended from said bed plate, an extension leaf pivotally connected to the said frame walls and adapted to swing about a horizontal axis and to slide vertically downwards and inside the frame Walls, spring means exerting an upwards bias upon said extension leaf and adapted to propel the same out of its lowermost position, latch means to lock the leaf in said lowermost position, and an opening in said frame walls for access to said working mechanism, the extension leaf, when retracted, covering said opening and, when extended, permitting access through it to the said working mechanism.

SOLOMON ADLER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,063,677 Grothe et al. June 3, 1913 1,064,110 Tobey June 10, 1913 1,227,536 Hartman May 22, 1917 

